heres a link that might help a bit
Samsung UE40B7020 / UE40B7020WW / UE40B7000 Review
i havent got one but im going to get one and im heading for the 7 series. dont know if it will be the 7000 or the 7020 yet as we have always had the piano black look and might like a change to the rose shade on the outside.
to me the 7 series is the one to go for as its got more on it than the 6 ( like the wired internet ect).
if you got the dosh then the 8 is the best by the looks with the 200hz.
but i stress this is only what i have read. i like yourself have been into a shop to see it and my jaw dropped, it was just amazing, that was about 6 weeks ago and been looking ever since. it is going to be my next tv for sure and hope soon rather than later.